Roger over at the Tunze RC forum seems to usually recommend placement of pumps in the rear top corners so they hit each other near the middle of the front glass. I have mine setup this way with the third below the left pump blowing down the back of the tank. On interval 2 right now and I don't seem to have dead spots. Actually I can't keep my sand in the front of back of the tank! I also get some great surface waves...on the ends there is maybe 3/4" movement.
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